1) Is it possible to create a PDF that could be smoothly scrolled through horizontally on a laptop (mac)?

2) I know that in Adobe Reader it's possible to scroll vertically and display pages as one continuous page. However, the pages have black dashed lines where they meet. Is it possible to get rid of those black lines, so that the document appears as one long page you can scroll through?

Thanks a lot for your reply. It seems that PDFs are also meant to be for presentations. You can make them interactive and add videos, etc. For things like magazines, journals it would be useful to have a horiztonal scroll to emulate the experience of flicking through pages, rather than the vertical scroll.

It's actually a good idea to expand the pages in InDesign - this way there are no dashed black lines when scrolling.

A long page (or even a wide page) can be good for presentations but remember

- users doing their own navigation are likely to find themselves a bit lost - and their normal habits (like "fit whole page on screen" or "keyboard shortcut to move down a page") will let them down

- it's a nightmare for printing.

- to consider what it will do in the many other widespread PDF viewers (e.g. Chrome, Safari, Preview, FireFox, Windows 8 Reader...)

It's imporant to remember that your intended purpose of the PDF isn't always the user's intended purpose, and consider whether you want to make things harder for them. Sometimes it may be just what you want, sometimes not.